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12z-(42z+6)=82
We move all terms to the left:
12z-(42z+6)-(82)=0
We get rid of parentheses
12z-42z-6-82=0
We add all the numbers together, and all the variables
-30z-88=0
We move all terms containing z to the left, all other terms to the right
-30z=88
z=88/-30
z=-2+14/15
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